Tattooing. Gloved hands of a tattoo artist at work imprinting a tattoo into a patient's skin. The electrical device being used contains multiple needles at its tip. The needles puncture the skin while a pigment (here, green) is introduced into the wound. Tattoos thus create a permanent and artistic design, some highly elaborate. Tattooing is potentially dangerous if sterile procedures are not followed. There is a risk that viruses such as those which cause hepatitis and AIDS may be transmitted through the needles. Some tattoos can be removed by laser treatment.